All Questions
6
questions
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34
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Why are published stats generally given as +/- standard deviation?
I've been wondering why most publications give stats as mean +/- standard deviation, even for things like measurement devices, where reproducibility is a major concern. (E.g., for a given sample, our ...
2
votes
2
answers
58
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How can I confidently state the error of a specific test is within a range with a 95% confidence interval
I have a test that provides values with known amounts of error. For instance the error on the test
(Value - TrueValue) = -7.62, -9.33, -8.36, -9.79,-10.45, -9.51, -10.83, -10.64, -9.96, -10.30
I want ...
1
vote
0
answers
63
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Generating a confidence interval for the difference in standard deviation between two populations
Background
I've made a device which sizes potatoes, and one component in that device comes with a known error with respect to mean and standard deviation. I want to know whether my device - which ...
- 277
0
votes
1
answer
56
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Calculating the probability that the standard deviation is above or below a certain value
I'm given $n$ samples from a random number generator that produces normally distributed values. Can I calculate the probability that the standard deviation that the RNG uses is $\sigma > \sigma_{...
2
votes
1
answer
2k
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How to calculate the standard deviation of a sample and its 95% CI if I know the variance and its 95% CI?
I apologize if my question is extremely simple, but you know my name.
I have only the variance of a sample and its 95% confidence intervals, nothing more, nothing less.
Please correct me if I am ...
0
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0
answers
223
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Narrow confidence interval for variance
When we have an estimate of the variance $s^2$ obtained from $n$ observations, $x_1, x_2, \dots, x_n$, we can calculate a 95% confidence interval of the true variance
$$\left( \frac{(n-1)s^2}{\chi^2_{...
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